Yes..its an MPLS network...at present there are 14 PE routers connected to two core routers..
Now the client would like to add another 4 PE routers..as there are no free slots available in the cusrrent core routers, he wants to look into the possibility of distributing the links between three core routers...
But if there are any design concerns with 3 core design, then he is ready to upgrade the existing core to a higher model with more slots.
I also suggested to have a 4 core or a 2 core which has more slots. At present they have two GSRs and all the PE routers are connected using STM-16, STM-64 and 10GE uplinks. Now they would like to add more PE routers with 10GE uplinks and we suggested to move to CRS-1 as it can accomodate more interfaces per slot.
But they would like to look at the possibility of adding another GSR in the core and distribute the PE links.
Hence if I have to suggest him a
2 X CRS-1 core, I have to give them justifications against 3 core design.
Currently Every PE is connected by one P and another P. Hopefully both P routers are connected back to back. But when the third P will be added in that case you need to add a switch and create a local peering, so that when the traffi will come to P and there after need to move to another P, In that case it will forward by switch. The main disadvantage of this is that you are increasing the broadcast domin of OSPF. The another option is that connect the P routers like given
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